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Backsides of drivers. Is nothing sacred?
- Thread starter Frozen J
- Start date
- Jun 6, 2012
- 4,837
- 6,859
- Disclosures
- I don't wait 30 minutes after eating, to go swimming.
- Apr 3, 2003
- 35,516
- 19,953
- Disclosures
- Editor-in-Chief, Bass Gear Magazine
- Apr 3, 2003
- 35,516
- 19,953
- Disclosures
- Editor-in-Chief, Bass Gear Magazine
- Apr 3, 2003
- 35,516
- 19,953
- Disclosures
- Editor-in-Chief, Bass Gear Magazine
The ASD1001 has a 12 ounce magnet. At 32,000 ounces per ton, you have 2,666 of them! But if you go by actual speaker weight, 2 lbs., you only have 1,000. I think you need to be more specific.
Passinwind
I know nothing.
- Dec 3, 2003
- 23,079
- 46,041
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- Designer/Toaster Tech @ Passinwind Electronics
1941 Gibson EH-100 w/field coil speaker:
Link Removed
Someone gave this yard sale refugee to me and I passed it along to another TB'er to restore, as I felt he would be able to do a more authentic job.
- Apr 3, 2003
- 35,516
- 19,953
- Disclosures
- Editor-in-Chief, Bass Gear Magazine
WOWEE!!! Must discuss this single transformer design. What's up with that? Never saw that before.
The EH-100 is an interesting amp. The early EH-100 had a transformer instead of a phase inverter, that later version had a tube. This amp did have a power transformer. Some early amps didn't, they ran directly off the line.
Interesting concept where the head fits into the cabinet. Ampeg wasn't the first to do that.
Interesting concept where the head fits into the cabinet. Ampeg wasn't the first to do that.
Cool info, David, but I don't know if I get it. So this amp of Charlie's...that's the power transformer I see, and instead of an output transformer it uses a phase inverter tube?
- Apr 3, 2003
- 35,516
- 19,953
- Disclosures
- Editor-in-Chief, Bass Gear Magazine
The phase inverter is often done with a tube. In some older amps juke boxes, Hammond organs, etc, they used a small transformer in place of the tube. The early EH-100 revision has this. This is separate from the output transformer and power transformer. Some amps, not all, have the field coil and the output transformer together. Note all the wires running to the speaker cabinet. It isn't just two. The big transformer is the power transformer.
Note that the Heritage uses machine screws and anchors to mount the speakers, the other cab uses wood screws.
Looking at these images reminds me how I usually disassemble everything that I get before I even plug it in. Only I'm too impatient to take pictures so I would know how to put things back together again.
I see...now I think I get it. Sounds like a total shock hazard
Well the old amps that didn't have a power transformer certainly were. You could get the full line voltage on the chassis. Touch something else that's grounded and zap.
